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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →How long do starfish live? The answer depends on the species: the common starfish typically lives about 5–10 years, while some sea stars have survived for several decades in aquariums. The sunflower sea star’s lifespan in the wild is still unknown, so no single number applies to every starfish.
Sea stars are often called starfish, but they are not fish. Their lifespans also differ enough that a species name and the words “wild” or “aquarium” are essential whenever a number is given.
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Key takeaways
- There is no universal starfish lifespan because NOAA identifies approximately 2,000 sea-star species.
- The common starfish (Asterias rubens) is generally reported to live about 5–10 years.
- The sunflower sea star (Pycnopodia helianthoides) has an unknown lifespan in the wild, while aquarium specimens have survived for several decades.
- Sea-star size cannot reliably reveal age because growth changes with food availability and environmental conditions.
- Sea stars are marine echinoderms, not fish, despite “starfish” being their familiar common name.
What is the average lifespan of a starfish?
The most accurate answer to “How long do starfish live?” is species-specific: the common starfish often lives about 5–10 years, while some sea stars have survived for several decades in aquariums. The sunflower sea star’s normal lifespan in the wild remains unknown, so no single number represents every starfish.
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“Starfish” is the familiar common name for sea stars. As NOAA Ocean Service explains, “Sea stars, commonly called, ‘starfish,’ are not fish.” Sea stars are marine echinoderms, related more closely to other echinoderms such as sea urchins than to finned fish.
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How long do different sea-star species live?
Different species have different lifespan evidence. Some have a reported typical range, whereas others have only limited observations or no reliable longevity estimate.
| Species | Wild lifespan evidence | Aquarium evidence | How to interpret the figure |
|---|---|---|---|
| Common starfish (Asterias rubens) | About 5–10 years; another reference reports 6–10 years and cites a 7–8-year estimate | No comparable aquarium figure established in the cited sources | A species-specific typical range, not an average for all sea stars |
| Sunflower sea star (Pycnopodia helianthoides) | Unknown | Some specimens have lived for several decades | Captive longevity cannot be converted into a wild average or maximum |
| Leather sea star (Dermasterias imbricata) | Unknown | Unknown | The cited profile does not establish a lifespan |
For the common starfish, The Wildlife Trusts (2020) reports an average lifespan of 5–10 years. The Marine Life Information Network (2019) reports a 6–10-year range and cites a 7–8-year estimate attributed to Schäfer (1972). The small difference between these figures reflects the evidence for this species; neither figure should be applied to sea stars generally.
Do starfish live for 30 years?
Some sea stars can live for several decades in aquariums, so a 30-year sea star is possible in the context of exceptional captive longevity. That does not mean that every starfish lives 30 years, that 30 years is a normal wild lifespan, or that 30 years is the maximum age for the group.
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The distinction is especially important for the sunflower sea star. NOAA Fisheries (2023) reports that the species’ longevity in the wild is unknown, while aquarium specimens have been held for several decades. The responsible conclusion is therefore “unknown in the wild,” not “30 years.”
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Why is the lifespan of many sea stars unknown?
Sea stars are a large and varied group. NOAA Ocean Service (2024) states that there are approximately 2,000 sea-star species, all living in marine waters. Species differ in habitat, food supply, growth rate, predators, disease exposure, reproduction, and the amount of long-term research available.
Researchers also cannot usually determine a wild sea star’s age simply by measuring it. Studies of Asterias rubens describe growth-rate plasticity, meaning growth changes under different conditions. A well-fed sea star and a food-limited sea star of the same size may not be the same age. The research literature on sea-star morphology and settling helps illustrate why size-based age estimates require caution.
Can you tell a starfish’s age by its size?
No. Sea-star size is not a dependable age gauge because food availability and environmental conditions affect growth. A large sea star is not automatically old, and a smaller individual is not necessarily young.
Size can still be useful for describing a specimen or studying growth within a controlled research project. Size alone, however, cannot provide a trustworthy birthday or lifespan estimate for an individual found in the wild.
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- Glass Sea Animal Look – Designed with a glossy glass-like finish, these tiny sea creatures catch the light beautifully and create a delicate, crystal-style look. A more refined alternative to ordinary plastic or resin fish tank ornaments.
- Perfect for Cute Aquarium Styling – Use this set to build a coastal, mermaid, beach or ocean theme inside your aquarium. It is especially suitable for small tanks, pink or blue fish tank decor themes, betta tank accessories and playful underwater scenes.
- Also Cute for Shelf and Desk Decor – Beyond aquarium styling, these mini sea animal ornaments can be displayed on a desk, shelf, vanity, nightstand or beach-themed room corner. They work well as tiny coastal accents for people who love ocean decor.
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What is the sea-star life cycle?
Most sea stars reproduce by releasing eggs and sperm into the water. Fertilized eggs develop into planktonic larvae, which drift in the water column before settling, changing form, and becoming juvenile sea stars.
For the sunflower sea star, Aquarium of the Pacific (2025) describes a planktonic larval period of roughly 4–10 weeks before settlement. The same source notes that sunflower sea stars may reach reproductive maturity as early as three years. Reproductive maturity is not lifespan: reaching maturity at three years does not mean the animal lives only three years.
Some sea stars can also reproduce through fragmentation or regenerate lost arms. Regeneration is not immortality. A sea star can still die from disease, starvation, predation, or environmental stress, and a detached arm can reproduce only in species and circumstances where enough of the central disk is retained.
Does regeneration mean a starfish cannot die?
No. Regeneration allows some sea stars to replace lost arms, but regeneration does not prevent death or establish an unlimited lifespan. Aquarium of the Pacific’s sea-star education material describes regeneration and the different ways sea stars reproduce; those abilities should not be mistaken for biological immortality.
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What affects sea-star survival?
Food, habitat quality, predators, disease, temperature, water conditions, and other environmental stresses can all affect whether a sea star survives and grows. These factors help explain why an aquarium longevity record cannot automatically describe what happens to the same species in the ocean.
The sunflower sea star is also a conservation concern. NOAA Fisheries’ species profile identifies sea-star wasting syndrome as the primary threat in its profile. Aquarium of the Pacific describes the sunflower sea star as an important predator in kelp-forest ecosystems. Conservation threats provide context for the species’ survival, but they do not supply a missing lifespan number.
What should children and families use to learn more?
For children, parents, and teachers who want more than the lifespan answer, a starfish life-cycle book can provide an age-appropriate introduction to anatomy, behavior, habitat, and development. Starfish by Emma Bassier is described as nonfiction for ages 6–8, while Crabtree Publishing’s life-cycle nonfiction catalog shows the broader educational format, including photographs, glossaries, indexes, and teacher-oriented materials. Check the retailer’s current listing and availability before purchasing.
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Most readers should not expect one universal starfish lifespan. The common starfish often lives around 5–10 years, some sea stars have survived for several decades in aquariums, and the normal wild lifespan of species such as the sunflower sea star remains unknown.
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Frequently Asked Questions
What is the average lifespan of a starfish?
There is no reliable average lifespan for all starfish because the group includes approximately 2,000 sea-star species. The common starfish is often reported at about 5–10 years, but that figure is species-specific.
Do starfish live for 30 years?
Some sea stars have lived for several decades in aquariums, so a 30-year sea star is possible in captivity. A 30-year figure should not be treated as a typical lifespan or a wild maximum for all starfish.
Can you tell a starfish’s age by its size?
No. Sea-star size is not a dependable age gauge because food availability and environmental conditions change growth rates. Two sea stars of the same size may be different ages.
Are starfish actually fish?
No. Starfish are sea stars, which are marine echinoderms rather than fish. “Starfish” is simply the familiar common name.
The Bottom Line
Bottom line: A starfish does not have one universal lifespan. Use about 5–10 years for the common starfish, treat several-decade aquarium records as exceptional captive longevity, and describe the sunflower sea star’s wild lifespan as unknown.
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